The research and implementation of velocity analysis methods for reverse time migration angle-gather

Reverse time migration can improve the imaging quality of complex medium evidently, compared with other imaging methods, but it requires higher conditions than others to the accuracy of velocity models. In addition to providing the information of velocity for depth migration, as an important prestack migration output, common imaging gather also can provide the information of amplitude and phase; at the same time, it provides a basis for subsequent explanation of attributes. We derive the formula for angle-gather velocity analysis, and focus on the analysis of the characteristics, stability, and velocity sensitivity of the formula, etc. that provide a theoretical basis for the analysis of the following speed. We give the specific implementation process of human-computer interaction velocity analysis for reverse time migration angle-gather. The test results of model data and actual data show that the human-computer interaction velocity analysis methods for reverse time migration angle-gather, that we provide, are practical, and can get a better background velocity model.